Someone please mod this +1 Informative, because this a key point. When people talk about "misleading advertisement", I also believe they are generally talking about expectations set by Sean Murray, who seems unable to constrain himself to describing features he knows will ship, and instead seems to describe the game as he'd imagine he would like it to become.
I'm a professional game developer, so naturally I've seen the "behind the scenes" view for a number of AAA title releases, especially the discrepancy between the released information and the true state of the game at the time. Most people would be shocked at how fluid the design of a game can be, how many iterations it takes to get things right, how many crazy ideas get tried and thrown away, and sometimes, how late in development things can really come together, especially if you're developing a lot of new technology. You have to be *extremely* disciplined when talking about your game, especially if you've got a hard deadline, because it's almost inevitable that many cool ideas and features are going to get cut simply because there's no time to polish them properly.
Unfortunately, some people like Peter Molyneux have demonstrated that they don't have the proper temperament for talking to the press or the public, because they can't stay on script, or can't simply tell the honest truth about a feature that's still very much up in the air. I suspect Murray is like this as well, and unfortunately, he damaged the reputation of the company because of his lack of media discipline.